Eighteen Sound 18LW1400 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 28 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 7.20
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 1103cm³
• Power handling P 1000W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 2.3mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 24.7N/A
• Motor constant Bl/√RE 11N/√W
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 190g
• Moving mass (without air load) MMD 160g
• Material Weather protected

Suspensions

• Stiffness KMS 7.19N/mm
• Compliance CMS 139µm/N
• Equivalent volume to the compliance VAS 297L
• Mechanical resistance RMS 5.14N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 215mm
• Flange thickness 26mm
• Mounting depth 189mm
• Volume occupied by the driver (estimated) 7.4L
• Net weight 13.3kg